<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="cateTapHandler(i)">{{item.cat_name}}</view>
        </block>
        
      </scroll-view>
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view v-for="(item,i) in cateLevel2" :key = "i">
          <view class="right-scroll-view-title">
            /{{item.cat_name}}/
          </view>
          <view class="right-scroll-view-item">
            <view class="right-scroll-view-item-container" v-for="(item2,i2) in item.children" :key="i2" @click="gotoGoodsList(item2)">
              <image :src="item2.cat_icon.replace('dev','web')"></image>
              <text>{{item2.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    methods:{
      async getCateList(){
        const {data:res} = await uni.$http.get('https://api-ugo-web.itheima.net/api/public/v1/categories')
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      cateTapHandler(i){
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item) {
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?cid=" + item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:"/subpkg/search/search"
        })
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight -50 
      this.getCateList()
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
      width: 120px;
      .left-scroll-view-item{
        text-align: center;
        line-height: 60px;
        font-size: 12px;
        background-color: #f7f7f7;
        
        &.active {
          background-color: #ffffff;
          position: relative;
          &::before{
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            top: 25%;
            left: 0;
          }
        }
      }
    }
  
    .right-scroll-view-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .right-scroll-view-item{
      display: flex;
      flex-wrap: wrap;
      .right-scroll-view-item-container{
        width: 33.33%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        image{
          width: 60px;
          height: 60px;
        }
        text{
          font-size: 12px;
        }
      }
    }
  }
</style>
